All In Agenda: Fmr. NFL player Chris Kluwe joins All In

1. Congress returned Monday ready to hash out what to do about the 1.3 million Americans who lost unemployment benefits three days after Christmas. Joining Chris Hayes to discuss Republican obstruction on this issue are Director of Budget and Regulatory Policy, Mattie Duppler, and Connecticut Senator Chris Murphy

2. Last Thursday, All In aired a segment on "snow trollers," climate deniers who claim that climate change isn't real because it's cold.  The criticism persists so we are back to clear the (cold) air: winter weather does not mean climate change is fake. Chris Hayes will be joined by Senior Political Columnist at the Washington Examiner, Tim Carney.

3. In an appearance on MSNBC's Morning Joe, New York Rep. Peter King said Sen. Rand Paul was "creating this hysteria" for wanting to file a lawsuit against the Obama administration for the NSA's spying practices. Joining All In to discuss the political significance of King's remarks is Washington Bureau Chief of Buzzfeed, John Stanton.

4. After being let go by the Minnesota Vikings, gay rights activist, Chris Kluwe wrote an open letter entitled, "I Was An NFL Player Until I Was Fired By Two Cowards And A Bigot." Chris Kluwe joins Chris Hayes to talk why he thinks his career ended shortly after his activism began.

5. The Supreme Court halted same-sex marriage in Utah on Monday. Joining Chris Hayes to discuss what happens from here are Marriage Project Director of Lamda Legal, Camilla Taylor and Editor-in-Chief of The Advocate, Matthew Breen.